Add legacy CFW instructions to the landing page

docs/user-guide/introduction.md

@@ -50,6 +50,12 @@ This guide has the end goal of taking a completely unmodified Wii U from stock t
 >
 >  A 32GB SD Card will be enough for most use-cases. A Micro SD Card in an adapter will work fine.
 
+?> **If you have an existing legacy CFW setup** </br>
+    For **CBHC** users: Go to the [Uninstall CBHC](../uninstall-cbhc) page to uninstall CBHC. </br>
+    For **Haxchi** users: Uninstall the Haxchi app from Data Management in the System Settings app. </br>
+    For **Mocha CFW (Indexiine)** users: Go to the [Uninstall Indexiine](../uninstall-indexiine) page to uninstall Indexiine. </br>
+    For **Mocha CFW (Online Exploit)** users: You do not need to do anything before following this guide.
+
 If everything goes according to plan, you will lose no data and end up with everything that you started with (games, saves, NNID, etc, will be preserved).
 
 Keep your device plugged in throughout the entire process to avoid data loss or damage from an unexpected power-off.